Hex fastener



FIG. 1 is a front view of a hex fastener showing my new design;

FIG. 2 is a rear view of the hex fastener;

FIG. 3 is a left side view of the hex fastener, a right side view being a mirror image thereof;

FIG. 4 is a top view of the hex fastener, a bottom view being a mirror image thereof; and,

FIG. 5 is a top front side perspective view of the hex fastener. 

CLAIM The ornamental design for a hex fastener, as shown and described. 